—Listen! Peter is singing in the classroom! —It _____ be him. He has gone back to his hometown.

题型：单选题题类：常考题难易度：普通

—Listen! Peter is singing in the classroom!
—It _____ be him. He has gone back to his hometown.

A、must B、mustn't C、may not D、can't

举一反三

- Yes, he _____ finish his homework first.

You should{#blank#}1{#/blank#}more time{#blank#}2{#/blank#}with your daughter．

— I'm afraid you _________. It's a non-smoking area.

—Yes, you

—It______be her. She has gone to New York.

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